LT1943 - High Current Quad Output Regulator for TFT LCD Panels
Features
- 4 Integrated Switches: 2.4A Buck, 2.6A Boost,
- 0.35A Boost, 0.35A Inverter (Guaranteed Minimum Current Limit)
- Fixed Frequency, Low Noise Outputs
- Soft-Start for all Outputs
- Externally Programmable VON Delay
- Integrated Schottky Diode for VON Output
- PGOOD Pin for AVDD Output Disconnect
- 4.5V to 22V Input Voltage Range
- PanelProtectTM Circuitry Disables VON Upon Fault
- Available in Thermally Enhanced 28-Lead TSSOP
Typical Application
Description
The LT1943 quad output adjustable switching regulator provides power for large TFT LCD panels. The device, housed in a low profile 28 pin thermally enhanced TSSOP package, can generate a 3.3V or 5V logic supply along with the triple output supply required for the TFT LCD panel. Operating from an input range of 4.5V to 22V, a step-down regulator provides a low voltage output VLOGIC with up to 2A current. A high-power step-up converter, a lowerpower step-up converter and an inverting converter provide the three independent output voltages AVDD, VON and VOFF required by the LCD panel. A high-side PNP provides delayed turn-on of the VON signal and can handle up to 30mA. Protection circuitry ensures that VON is disabled if any of the four outputs are more than 10% below the programmed voltage.
All switchers are synchronized to an internal 1.2MHz clock, allowing the use of low profile inductors and ceramic capacitors throughout. A current mode architecture provides excellent transient response. For best flexibility, all outputs are adjustable. Soft-start is included in all four channels. A PGOOD pin can drive an optional PMOS pass device to provide output disconnect for the AVDD output.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT1943EFE#PBF | TSSOP-28 | FE | E | 05-08-1663 (EB) | Yes |
| LT1943EFE#TRPBF | TSSOP-28 | FE | E | 05-08-1663 (EB) | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT1943EFE#PBF | TSSOP-28 | E | $6.69 | $4.75 | Yes | |
| LT1943EFE#TRPBF | TSSOP-28 | E | $4.87 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC620A | LT1943EFE | 4-Output Sw. Reg. For TFT-LCD Panels, Vin = 8-20V, Vout = 3.3V @ 2A, 13V @ 500mA, 30V @ 30mA, -10V @ 50mA | $150.00 | |
| DC697A | LT1943EFE | 4-Output Switching Regulator For TFT-LCD Panels, Vin = 4.5V - 8V, Vout = 3.3V @ 1.5A, 13V @ 500mA, 30V @ 20mA, -10V @ 50mA | $150.00 | |
| Buy Now | |||
Applications
- Large TFT-LCD Desktop Monitors
- Flat Panel Televisions
People Who Viewed This Product Also Viewed
- LT8471 - Dual Multitopology DC/DC Converters with 2A Switches and Synchronization
- LT1941 - Triple Monolithic Switching Regulator
- LT3471 - Dual 1.3A, 1.2MHz Boost/Inverter in 3mm × 3mm DFN
- LT3080 - Adjustable 1.1A Single Resistor Low Dropout Regulator
- LT8582 - Dual 3A Boost/Inverting/SEPIC DC/DC Converter with Fault Protection
- LT3083 - Adjustable 3A Single Resistor Low Dropout Regulator
- LT3580 - Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization
- LT1763 - 500mA, Low Noise, LDO Micropower Regulators
- LT8705 - 80V VIN and VOUT Synchronous 4-Switch Buck- Boost DC/DC Controller
- LT3463 - Dual Micropower DC/DC Converters with Schottky Diodes
Product Notifications
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.
Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LT1943
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
